Transport and superconducting properties of the Mg32(Al,Zn)49-type quasicrystalline and crystalline phases
K. M. Wong, E. Lopdrup, J. L. Wagner, Y. Shen, S. J. Poon
DOI 10.1103/PhysRevB.35.2494 · Physical Review B
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Abstract
We have investigated the transport and superconducting properties of the Mg32(Al,Zn)49-type icosahedral (I) and Frank-Kasper (FK) phases. All measurements were performed on single-phase samples. The I and FK phases of Al52.4Cu12.6Mg35 are superconducting below 0.81 and 0.73 K, respectively. Their electronic densities of states at the Fermi energy were obtained from upper-critical-field measurements. The I phase has (1) a higher low-temperature (4.2 K) resistivity of ≊58 μΩ cm compared with ≊23 μΩ cm for the FK phase and (2) a lower renormalized density of states of ≊0.52 states/eV?om versus ≊0.89 states/eV?om for the FK phase. The results are discussed with respect to theoretical models. Fitting magnetoresistance data of the I phase to localization theory gives a spin-orbit scattering time of ≊5×10−12 sec and an inelastic scattering time inversely proportional to T2. The resistivities of the I and FK phases of Al20.2Zn40.3Mg39.5 are also measured, and superconductivity is not detected down to ≊0.3 K. The transport properties of these icosahedral quasicrystals are compared with other I-phase alloys containing d valence electrons.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al52.4Cu12.6Mg35 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.81 | Pressure not reported | unknown |
| Al52.4Cu12.6Mg35 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.73 | Pressure not reported | unknown |
| Al51Cu12.6Mg36.4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.65 | Pressure not reported | unknown |
| Al51Cu12.6Mg36.4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.64 | Pressure not reported | unknown |
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